Artificial knee joint implant

Patent metadata

Field	Value
Publication number	US-9839520-B2
Application number	US-201414900379-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 27, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

Provided is an artificial knee joint implant with which the balance between ligaments can be properly adjusted. An artificial knee joint implant includes a plurality of types of tibial plates-having tibia-side sliding faces that slide against femoral components and respectively having at least either the tibia-side sliding faces at different positions with respect to a tibia in a state where the tibial plates are fixed to a tibial tray attached to a tibia, or the tibia-side sliding faces in different shapes.

First claim

The invention claimed is:

1. An artificial knee joint implant, comprising a femoral component and a tibial plate,
wherein the tibial plate has a tibia-side sliding face that slides against the femoral component, and
the tibial plate of the artificial knee joint implant comprises one of a plurality of tibial plate types respectively having at least either the tibia-side sliding faces at different positions with respect to a tibia in a state where the tibial plate types are fixed to a tibial tray attached to the tibia, or the tibia-side sliding faces in different shapes, and
wherein the tibia-side sliding faces are respectively provided with distalmost points positioned on a distalmost side in an extension direction, which is a direction in which the artificial knee joint implant that is fixed to a femur and the tibia is extended, and
each of the plurality of tibial plate types has the distalmost point whose position with respect to a knee joint is different from the positions of the distalmost points of the other tibial plate types in an anterior-posterior direction in a state where each of the plurality of tibial plate types are fixed to the tibial tray.

2. The artificial knee joint implant according to claim 1 ,
wherein the distalmost points include a first distalmost point, a second distalmost point, and a third distalmost point respectively corresponding to the plurality of tibial plate types, and
the plurality of tibial plate types include a first tibial plate type provided with the first distalmost point that is at a predetermined position in the anterior-posterior direction, a second tibial plate type provided with the second distalmost point that is closer to an anterior side than the first distalmost point is in the anterior-posterior direction, and a third tibial plate type provided with the third distalmost point that is closer to a posterior side than the first distalmost point is in the anterior-posterior direction.

3. The artificial knee joint implant according to claim 2 ,
wherein the first tibial plate type is provided with a first medial-side distalmost point and a first lateral-side distalmost point as two first distalmost points that are spaced away from each other in a left-right direction,
the second tibial plate type is provided with a second medial-side distalmost point and a second lateral-side distalmost point as two second distalmost points that are spaced away from each other in the left-right direction,
the third tibial plate type is provided with a third medial-side distalmost point and a third lateral-side distalmost point as two third distalmost points that are spaced away from each other in the left-right direction, and
separation intervals of the medial-side distalmost points in the anterior-posterior direction and separation intervals of the lateral-side distalmost points in the anterior-posterior direction are different from each other.

4. An artificial knee joint implant, comprising a femoral component and a tibial plate,
wherein the femoral component has a femur-side sliding face that slides over the tibial plate, and
the femoral component of the artificial knee joint implant comprises one of a plurality of femoral component types respectively having at least either the femur-side sliding faces at different positions with respect to a femur in a state where the femoral component types are fixed to the femur, or the femur-side sliding faces in different shapes, and
wherein the femur-side sliding faces are respectively provided with distalmost points positioned on a distalmost side in an extension direction, which is a direction in which the artificial knee joint implant that is fixed to the femur and a tibia is extended, and
each of the plurality of femoral component types has the distalmost point whose position with respect to a knee joint is different from the positions of the distalmost points of the other femoral component types in an anterior-posterior direction in a state where each of the plurality of femoral component types are fixed to the femur.

5. The artificial knee joint implant according to claim 4 ,
wherein the distalmost points include a first distalmost point, a second distalmost point, and a third distalmost point respectively corresponding to the plurality of types of femoral component types and
the plurality of femoral component types include a first femoral component type provided with the first distalmost point that is at a predetermined position in the anterior-posterior direction, a second femoral component type provided with the second distalmost point that is closer to an anterior side than the first distalmost point is in the anterior-posterior direction, and a third femoral component type provided with the third distalmost point that is closer to a posterior side than the first distalmost point is in the anterior-posterior direction.

6. The artificial knee joint implant according to claim 5 ,
wherein the first femoral component type is provided with a first medial-side distalmost point and a first lateral-side distalmost point as two first distalmost points that are spaced away from each other in a left-right direction,
the second femoral component type is provided with a second medial-side distalmost point and a second lateral-side distalmost point as two second distalmost points that are spaced away from each other in the left-right direction,
the third femoral component type is provided with a third medial-side distalmost point and a third lateral-side distalmost point as two third distalmost points that are spaced away from each other in the left-right direction, and
separation intervals of the medial-side distalmost points in the anterior-posterior direction and separation intervals of the lateral-side distalmost points in the anterior-posterior direction are different from each other.

7. An artificial knee joint implant, comprising a femoral component and a tibial plate,
wherein the tibial plate has a tibia-side sliding face that slides against the femoral component,
the artificial knee joint implant comprises a plurality of tibial plate types respectively having at least either the tibia-side sliding faces at different positions with respect to a tibia in a state where the tibial plate types are fixed to a tibial tray attached to the tibia, or the tibia-side sliding faces in different shapes,
the tibia-side sliding faces respectively have inclined faces formed on an anterior side and flat faces formed on a posterior side, and
the plurality of types of tibial plate types are provided with the inclined faces that have different lengths in an anterior-posterior direction.

Assignees

• Kyocera Medical Corp
• Kyocera Corp

Inventors

• Mizuguchi Tomoyuki

Classifications

• A61F2/3859

  Femoral components · CPC title

• A61F2/38 Primary

  for elbows or knees · CPC title

• A61F2/389

  Tibial components (A61F2/3868 takes precedence) · CPC title

• A61F2/3836 Primary

  Special connection between upper and lower leg, e.g. constrained · CPC title

• A61F2002/30607

  Kits of prosthetic parts to be assembled in various combinations for forming different prostheses · CPC title